Welcome to our forum.
Thanks Chas. you're my hero. I think I'd like to use the MPS so I can use the tub right away without the strong chlorine smell.How much would I use to do the heavy duty shock the first time? Just want to kill nasty bugs if they are in plumbing.Afterwards am I correct in adding 1tsp per person each time we are in, and then use about 5TBS of MPS weekly ? My tub is 450 gallons.